docs: def os_change_list(self, subid, params=None):
          ''' /v1/server/os_change_list
          GET - account
          Retrieves a list of operating systems to which this server can be
          changed.
  
          Link: https://www.vultr.com/api/#server_os_change_list
          '''
          params = update_params(params, {'SUBID': subid})
          return self.request('/v1/server/os_change_list', params, 'GET')